In version 1.21.4, the frame rate of the light and shadow is relatively high, but in version 1.21.5, the frame rate of the same setting is very low
Environment
Loading complementary lights and shadows in 1.21.4 and 1.21.5 respectively
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Comments 3
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However, this issue is Invalid.
Your game, launcher or server is modified.
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It could be possible that if the shaders aren’t updated properly it could lead to a bit of lag. does the game run slower without shaders, check to see if the fps changes when running without shaders in both versions, if the FPS is relatively the same then there might be an issue with the shaders.